* {padding:0px;margin:0px;}
.box {width:500px;height:180px;overflow: hidden; position: relative;}
ul {
    list-style:none;
    position: absolute;
    bottom: 10px;
    left: 50%;
    margin-left: -60px;
}
ul li {
    float: left;
    width: 10px;
    height:10px;
    background: #fff;
    border-radius: 50%;
    margin-right: 10px;
}
ul li.active {background: blue;}